Ventilation and filtration of clinics during COVID

Date Published: 
Tuesday, November 16, 2021

Dr Kelvin Ward talks about ventilation and filtration within a covid pandemic and what general practices need to know about multi-layered mitigation of risk.



  • 00:00 Intro
  • 01:13 How do we mitigate risk in our clinics?
  • 02:39 source control, ventilation and air filtration.
  • 04:39 Ventilation audit
  • 06:05 Air changes per hour
  • 07:15 Co2 monitoring
  • 08:55 Natural Ventilation
  • 10:55 HVAC systems
  • 12:24 Portable units and HEPA filtration
  • 14:11 Studies
  • 15:28 Purchasing HEPA filtration
  • 16:41 Avoiding extra features
  • 19:02 Still using PPE
  • 20:07 Take home messsages


Take-home messages

  • Covid is predominantly spread by inhalation of aerosols.
  • Covid will accumulate in spaces that aren’t adequately ventilated.
  • Risk remains after the patient has left the room.
  • A multi-layered approach to mitigate risk.
  • Seek professional advice (ventilation Audit).





Kelvin Ward
Urgent Care Physician

Kelvin is currently Medical Director at the Wellington Accident and Urgent Medical Centre. He also consults as a technical expert for clinic audits against the Urgent Care Clinic standard. He has a special interest in the use of point of care ultrasound in the acute primary care setting and in promoting its use to other clinicians and students. Most recently Kelvin has developed an interest in air quality and has been involved in promoting to GP leads and ministry.

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This presentation is intended for qualified health practitioners professional development and should not be relied upon for any other purpose. Any opinions offered are those of the presenter or other speaker and do not necessarily represent the views of Goodfellow Unit.